反应详情

To a suspension of 4-chloro-5H-pyrrolo[3,2-d]pyrimidine (141 mg) in N,N-dimethylformamide (2.5 mL) was added cesium carbonate (358 mg) under ice-cooling, and the reaction mixture was stirred while warming to room temperature for 15 min. To the reaction mixture was added 2-iodoethyl benzoate (298 mg), and the mixture was stirred at room temperature for 15 hrs. The reaction mixture was poured into 5% aqueous sodium hydrogen carbonate solution (50 mL), and extracted with ethyl acetate (50 mL×3). The organic layer was washed successively with water and saturated brine and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was subjected to silica gel chromatography (eluent:hexane/ethyl acetate=95/5→60/40). The object fraction was concentrated under reduced pressure and dried to give 2-(4-chloro-5H-pyrrolo[3,2-d]pyrimidin-5-yl)ethyl benzoate (205 mg) as a colorless transparent oil.

1. temperaturecooling
2. stirringthe mixture was stirred at room temperature for 15 hrs
3. extractionextracted with ethyl acetate (50 mL×3)
4. washThe organic layer was washed successively with water and saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe solvent was evaporated under reduced pressure
7. concentrationThe object fraction was concentrated under reduced pressure
8. customdried